java - show 0 as prefix if value is less than 9

Question

Still i am getting file name like below:

B-13-4-006.jpg

and

B-5-7-008.jpg

but now i want to show 0 as prefix if value less than < 9 else as it is, in short want to show values in double figures, see my code below using to file name

               "B-" + // prefix
                LoginActivity.strEventID + "-" + // eventID 
                LoginActivity.strOperativeID + "-" + // operativeID 
                getNextNumber() + // counter 
                ".jpg" 

but i require, files name should look like below:

B-13-04-006.jpg

and

B-05-07-008.jpg

Answer 1

Use String.format("%02d", yournumber); to show 0 with a number if less than 10 (for two digits number).

Use method like

private String getPaddedNumber(int number) {
    return String.format("%02d", number);
}

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You can read Formatter documents for more details.

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How to use into your code

"B-" + // prefix
        getPaddedNumber(LoginActivity.strEventID) + "-" + // eventID 
        getPaddedNumber(LoginActivity.strOperativeID) + "-" + // operativeID 
        getPaddedNumber(getNextNumber()) + // counter 
        ".jpg"